163491287 has 2 divisors, whose sum is σ = 163491288. Its totient is φ = 163491286.

The previous prime is 163491283. The next prime is 163491331. The reversal of 163491287 is 782194361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 163491287 - 2² = 163491283 is a prime.

It is equal to p_9159197 and since 163491287 and 9159197 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163491281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81745643 + 81745644.

It is an arithmetic number, because the mean of its divisors is an integer number (81745644).

Almost surely, 2^163491287 is an apocalyptic number.

163491287 is a deficient number, since it is larger than the sum of its proper divisors (1).

163491287 is an equidigital number, since it uses as much as digits as its factorization.

163491287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 163491287 is about 12786.3711427441. The cubic root of 163491287 is about 546.8038170076.

The spelling of 163491287 in words is "one hundred sixty-three million, four hundred ninety-one thousand, two hundred eighty-seven".